MG5 Grassi style armchair, 80s/90s edition

This armchair is in superb condition, whether it is the chrome or the leather. This is not a period armchair, but an authentic Marcel Breuer - reissue from the 80s/90s. (email from a recognized design expert at your disposal) It is numbered on the leather on the back. Unfortunately, a part is missing. I don't know who to contact for the repair, hence the sale. See behind the photo, the "screw" that connects the seat to the frame is missing on the right side. Total depth 55, seat depth 40